194 



HENRY LESLIE OSBORN 



TABLE 2 

 Measurements used in determining the -position of the genital opening 



compression may be supposed to have acted equally in all direc- 

 tions and so has not influenced these results. 



A comparison of the figures of the different species of this 

 genus as given in Braun's paper ('00) shows that the position of 

 the genital pore differs very much in them, it being very near the 

 posterior end of the body in C. heluans (fig. 10 a) 80.3 per cent, 

 and very posterior also in C. dimorphum. It is nearly 79 per 

 cent in the maximum case of C. marginatum of the table just 

 given. 



The genital pore opens into a chamber, the atrium (fig. 3) 

 in which the male and female genital systems end. The opening 

 of the terminal part of the uterus, the 'metraterm,' lies in this 

 atrium anterior to the position of the cirrus of the male system. 



